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为了解我县法定传染病的实际发病情况，我们于１９９９年５～６月随机抽查县级医院１所，乡镇卫生院５所及所辖村或街道抽取５所卫生所。调查１９９８年１～１２月份的门诊日志或病历住院登记，凡确认为法定传染病的病例均为调查对象。同时进行居民法定传染病回顾性入户调查。
In order to understand the actual incidence of legal infectious diseases in our county, we randomly sampled 1 county-level hospital, 5 township hospitals and 5 clinics in villages under its jurisdiction from May to June 1999. Investigation of January to December 1998 outpatient log or medical records of hospitalizations, where identified as a legal case of infectious diseases were investigated. At the same time, a retrospective investigation of resident legal infectious diseases was conducted.